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# Questions

10
votes
2
answers
317
views

### Geometrically unirational varieties that are not unirational

1d ago Jason Starr 1,935915

1
6
votes
1
answer
239
views

### E an elliptic curve over Z[1/N], how many p such that E(Z/p^2) = (Z/p)^2?

feb 13 at 13:36 René Pannekoek 1,212313

1
7
votes
1
answer
416
views

### Do torsors give a long exact sequence of cohomology?

feb 11 at 13:57 René Pannekoek 1,212313

6
votes
1
answer
198
views

### How do you compute the primes of bad reduction?

dec 13 at 17:57 François Brunault 7,63411437

1
10
votes
2
answers
572
views

### Surjectivity of reduction maps of elliptic curves over Q

nov 24 at 1:25 René Pannekoek 1,212313

2
6
votes
1
answer
220
views

### Are ranks of Jacobians over number fields unbounded?

nov 19 at 21:53 Felipe Voloch 16.7k23661

2
votes
1
answer
232
views

### Spreading out of flat morphisms of schemes

feb 26 12 at 17:34 Laurent Moret-Bailly 7,3661929